2.1 Matter

Question 1

Three main characteristics of an element

Answer 1

Consists of only one kind of atom
Cannot be broken down into simpler type of matter
Can exist either as atoms or molecules

Question 2

Mass of protons and neutrons

Answer 2

1.67x10-27kg

Question 3

What is an isotope

Answer 3

atom gaining neutron through nuclear process

Question 4

Mass of electron

Answer 4

9.11x10-31kg

Question 5

What is a molecule

Answer 5

Structure containing two or more atoms held by chemical bonds

Question 6

What is covalent bond

Answer 6

Forms between two non-metals by sharing electrons e.g. H20

Question 7

What is ionic bonds

Answer 7

Occurs when an atom transfers one or more electrons to another atom

Question 8

What is a chemical compound

Answer 8

Pure substance made up from two or more different elements which have been jointed together by chemical reaction

Question 9

What is a mixture

Answer 9

Combination of at least two substances that are not chemically linked

Question 10

How many elements in periodic table

Answer 10

118

Question 11

What is atomic number

Answer 11

number of protons in nucleus

Question 12

Boiling and evaporation

Answer 12

Liquid to Gas

Question 13

Condensation

Answer 13

Gas to Liquid

Question 14

Melting

Answer 14

Solid to Liquid

Question 15

Freezing

Answer 15

Liquid to Solid

Question 16

Sublimation

Answer 16

Solid to Gas

Question 17

Deposition

Answer 17

Gas to Solid